Plane



Nov; 23 1926.

T. T. TVEDT .PLANE Filed Dec.

INVENTOR T\\O\\\C-$T T iech' ATTORNEYS Patented Nov. 23, 1926. v

UNITED STATEEt THOMAS T. 'IVEDT, OF BROOKLYN, NE! YGRK.

PLANE.

Application filed December 5, 1822. Serial No. 805,011.

Thisinvention relates to planes of the general character disclosed in a1plicants application Serial Number 516,908, filed November 22, 1921. Theplane shown and described in said application comprises a small thinblade mounted so that it may be quickly and easily removed from theplane and discarded when it becomes dull and a sharp blade inserted inits place.

One object of the present invention is to produce a novel, improved, andsimplified construction for holding the blade and clamping the same inplace in the stock.

Another object of the invention is the provision in a plane of a singlebit or plate designed to replace the back plate and blade ofconventional plane constructions. A still further object is theprovision in a plate of a blade having a detachable edge portionassociated therewith so that the elements may be inserted in the planeas a unit.

With this and other objects in view, the invention comprises the noveland improved constructions, arrangements and combinations of partshereinafter described and particularly pointed out in the claims, theadvantages of which will be readily understood and appreciated by thoseskilled in the art.

The invention will be clearly understood from the accompanying drawingsillustrating a plane embodying the invention in its preferred form andthe following detailed description of the construction therein shown.

In the drawings Fig. 1 is a view in longitudinal vertical section of aplane embodying the invention;

Fig. 2 is a detail face view of the iron with a blade applied thereto;

Fig. 3 is a perspective view of the iron and blade; and

Fig. 4 is a perspective view of the thin removable blade.

In the embodiment of the invention illustrated in the drawings, theplane comprises a stock 2 having a stud 4 at its forward end to begrasped by the operator in operating the plane and formed with anopening 6 through which the blade projects below the lower surface ofthe stock. The small thin removable blade is indicated at 8 and ismounted on the lower end of an iron indicated at 10 which is supportedon the stock for sliding adjustment at an angle to the lower surface ofthe stock.

In the present embodiment of the invention the blade is mounted on thelower surface of the iron so that when the iron is placed in position inthe stock the blade is located between an inclined surface 12 formed onthe stock and the iron. The blade is clamped between the stock and theiron by forcing the forward end of the iron toward the stock. The planeillustrated in the drawing is especially adapted for use as a blockplane to plane across the grain of the wood. It will be noted that eachedge of the blade is formed by a single bevel extending from one face ofthe blade toward the other face thereof. To enable the blade to cut moreelliciently and reliably across the grain of the wood-the blade isplaced on the iron so that the bevel on its forward cutting edge will beuppermost. The character of the blade which is preferably employed issuch that it has considerable flexibility and therefore requires supportadjacent its cutting edge when it is in operation. In the constructionshown. the blade is supported 011 its rear side adjacent its cuttingedge by the edge of the stock at the lower end of the inclined surface12 and the blade is supported on its forward side adjacent this edge bythe lower end of the iron.

The blade is located in a predetermined and definite position withrelation to the forward end of the iron preferably by means of pins 14-mounted in the iron and arranged to engage in openings 16 formed in theblade, said openings being located centrally of the blade so that eitheredge will be located with relation to the iron by engagement of the pinsin said openings. The blade is thus mounted on the iron so that it maybe readily reversed or removed from the plane and the operating cuttingedge will be located in a predetermined and definite position withrelation to the forward end of the iron by engagement of'the pins in theopenings in the blade. To hold the blade in position on the iron whilethe iron is placed in or removed from the stock, a spring plate 16 issecured to the iron and is arranged so that the rear portion of theblade may be inserted beneath the same when the blade is applied to theiron.

The rear end of the iron is supported on a slide block 18 mounted toslide on an inclined guideway formed at the upper end of an up right 20on the stock. This slide bloc-k carries a pin 22 which engages in anopening 24 ion in the iron. The slide block 18 is adjusted to adjust theiron with relation to the stock by means of a differential screw 26, thelower portion of which is threaded into a projecion on the slide blockand the upper portion of which is threaded into the upright 20, thisscrew carrying a hand wheel 28. The portion of the screw which isthreaded into the block 18 has a different pitch than that of theportion which is threaded into the upright 20 and by properlyproportioning the pitches of the different parts of the screw, anydesired degree of fineness of adjustment of the iron may be secured.

The forward end of the iron is forced toward the stool: to clamp theblade between the iron and the stock by means of a clamping plate 30,the forward portion of which is located beneath a transverse pin 32mounted on the stock and the forward end of which is arranged to engagethe iron as shown in Fig. 1. The rear end of the clamping plate is movedoutwardly to force the forward end thereof against the iron by means ofan adjusting screw 34 threaded through said Having explained the natureand object of the invention and having specifically described a planeembodying the invention in its preferred form, what is claimed is: V

l. A single iron or plane bit or blade and a thin detachable portionconstituting the cutting edge of said bit or blade and having a bevel toform such edge and the main bit or bevel having a like bevel so that thesaid bit or blade may be clamped to the bit stock and the detachableportion clamped between the main bit or blade and the plane stock withthe bevel face upward.

2. A single iron or plane bit or blade and a thin detachable portionconstituting the cutting edge of said bit or blade and having a bevel toform such edge, the bit being provided with a similar bevel whereby thesaid blade may be clamped tothe bit stool; with the detachable portiondisposed between face upward and means on said bit engage able with saiddetachable portion for locating said portion in a predetermined definiteposition.

Signed at New York, N. Y., this 2nd day of December, 1922.

THOMAS T. TVEDT.

the main bit and the plane stock the bevel

